<template>
  <view
    :class="[styleType === 'text' ? 'segmented-control--text' : 'segmented-control--button']"
    :style="{ borderColor: styleType === 'text' ? '' : activeColor }"
    class="segmented-control"
  >
    <view
      v-for="(item, index) in values"
      :class="[
        styleType === 'text' ? '' : 'segmented-control__item--button',
        index === currentIndex && styleType === 'button'
          ? 'segmented-control__item--button--active'
          : '',
        index === 0 && styleType === 'button' ? 'segmented-control__item--button--first' : '',
        index === values.length - 1 && styleType === 'button'
          ? 'segmented-control__item--button--last'
          : ''
      ]"
      :key="index"
      :style="{
        backgroundColor: index === currentIndex && styleType === 'button' ? activeColor : '',
        borderColor:
          (index === currentIndex && styleType === 'text') || styleType === 'button'
            ? activeColor
            : 'transparent'
      }"
      class="segmented-control__item"
      @click="_onClick(index, item)"
    >
      <view>
        <text
          :style="{
            color:
              index === currentIndex
                ? styleType === 'text'
                  ? activeColor
                  : '#fff'
                : styleType === 'text'
                  ? '#000'
                  : activeColor
          }"
          class="segmented-control__text"
          :class="
            styleType === 'text' && index === currentIndex ? 'segmented-control__item--text' : ''
          "
          >{{ getLabel(item) }}
        </text>
      </view>
    </view>
  </view>
</template>

<script>
/**
 * SegmentedControl 分段器
 * @description 用作不同视图的显示
 * @tutorial https://ext.dcloud.net.cn/plugin?id=54
 * @property {Number} current 当前选中的tab索引值，从0计数
 * @property {String} styleType = [button|text] 分段器样式类型
 *  @value button 按钮类型
 *  @value text 文字类型
 * @property {String} activeColor 选中的标签背景色与边框颜色
 * @property {Array} values 选项数组
 * @event {Function} clickItem 组件触发点击事件时触发，e={currentIndex}
 */
import { OUtils } from '@/utils/OUtils'

export default {
  name: 'UniSegmentedControl',
  emits: ['clickItem', 'tabClick', 'update:value'],
  model: {
    event: 'tabClick',
    prop: 'value'
  },
  props: {
    current: {
      type: Number,
      default: 0
    },
    values: {
      type: Array,
      default() {
        return []
      }
    },
    value: {
      type: [String, Number],
      default: ''
    },
    activeColor: {
      type: String,
      default: '#2979FF'
    },
    styleType: {
      type: String,
      default: 'button'
    },
    labelKey: {
      type: String,
      default: 'label'
    },
    valueKey: {
      type: String,
      default: 'value'
    }
  },
  data() {
    return {
      currentIndex: 0
    }
  },
  watch: {
    current(val) {
      if (val !== this.currentIndex) {
        this.currentIndex = val
      }
    }
  },
  created() {
    this.currentIndex = this.current
  },
  methods: {
    getLabel(item) {
      const { labelKey } = this
      if (OUtils.isObject(item)) {
        return item[labelKey] || ''
      }
      return item
    },
    _onClick(index, item) {
      if (this.currentIndex !== index) {
        this.currentIndex = index
        this.$emit('clickItem', {
          currentIndex: index
        })
      }

      this.$emit('tabClick', { item, index })
      this.$emit('update:value', this.getValue(item))
    },
    getValue(item) {
      const { valueKey } = this
      if (OUtils.isObject(item)) {
        return item[valueKey] || ''
      }
      return item
    }
  }
}
</script>

<style lang="scss" scoped>
.segmented-control {
  /* #ifndef APP-NVUE */
  display: flex;
  box-sizing: border-box;
  /* #endif */
  flex-direction: row;
  height: 36px;
  overflow: auto;
  /* #ifdef H5 */
  cursor: pointer;
  /* #endif */
}

.segmented-control__item {
  /* #ifndef APP-NVUE */
  display: inline-flex;
  box-sizing: border-box;
  /* #endif */
  position: relative;
  flex: 1;
  justify-content: center;
  align-items: center;
  margin: 12rpx 22rpx;
}

.segmented-control__item--button {
  border-style: solid;
  border-top-width: 1px;
  border-bottom-width: 1px;
  border-right-width: 1px;
  border-left-width: 0;
}

.segmented-control__item--button--first {
  border-left-width: 1px;
  border-top-left-radius: 5px;
  border-bottom-left-radius: 5px;
}

.segmented-control__item--button--last {
  border-top-right-radius: 5px;
  border-bottom-right-radius: 5px;
}

.segmented-control__item--text {
  border-bottom-style: solid;
  border-bottom-width: 2px;
  padding: 6px 0;
}

.segmented-control__text {
  font-size: 14px;
  line-height: 20px;
  text-align: center;
}
</style>
